// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_BASE_MODELS_TABLE_MODEL_OBSERVER_H_
#define UI_BASE_MODELS_TABLE_MODEL_OBSERVER_H_

#include "ui/base/ui_base_export.h"

namespace ui {

// Observer for a TableModel. Anytime the model changes, it must notify its
// observer.
class UI_BASE_EXPORT TableModelObserver {
public:
    // Invoked when the model has been completely changed.
    virtual void OnModelChanged() = 0;

    // Invoked when a range of items has changed.
    virtual void OnItemsChanged(int start, int length) = 0;

    // Invoked when new items are added.
    virtual void OnItemsAdded(int start, int length) = 0;

    // Invoked when a range of items has been removed.
    virtual void OnItemsRemoved(int start, int length) = 0;

protected:
    virtual ~TableModelObserver() { }
};

} // namespace ui

#endif // UI_BASE_MODELS_TABLE_MODEL_OBSERVER_H_
